High speed alternating current (AC) motor power supply current detection method
A technology of AC motor and power supply current, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of slow protection speed, reduced production efficiency, high frequency of power supply, etc., achieve accurate detection and protection, and improve production Efficiency, the effect of improving maintenance efficiency
Active Publication Date: 2013-06-19
SUZHOU VEGA TECH CO LTD
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[0003] For high-speed AC motors (160K ~ 500K rpm), the power supply frequency is high (3 ~ 8KHz), and the harmonic components brought by high frequency switching (60K ~ 100K Hz) are large, and the ordinary motor current detection methods and devices are no longer suitable In such an application environment, it is manifested in: its threshold is unreliable, resulting in malfunction or non-operation; the protection speed is too slow, and the motor will be burned in severe cases, resulting in economic losses and a reduction in production efficiency
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[0024] The method for detecting the power supply current of a high-speed AC motor is particularly characterized in that it includes the following steps: first, a Hall sensor is used to sense the phase current, and the current signal output by the secondary side of the Hall sensor is converted into a voltage signal through a sampling resistor. Then, the voltage signal is filtered to remove the harmonic component to obtain the fundamental voltage signal. Then, the absolute value calculation is performed on the fundamental voltage signal to obtain a positive voltage signal that satisfies the sampling input range of the microprocessor. At the same time, the fundamental voltage signal is converted into a square wave signal corresponding to its cycle, so that the microcontroller can determine the start and end moments of the signal cycle. Afterwards, the microcontroller 4 samples and calculates a complete cycle of the absolute valued positive voltage signal to obtain the effective v...
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The invention relates to a high speed alternating current (ac) motor power supply current detection method and an apparatus thereof. The method comprises the following steps: sensing phase current by a hall sensor; comparing and determining an effective value with a preset threshold. A rapid and stable detection can be performed through cooperation between current signal acquisition, a conversionmodule, a current detection module, a microcontroller, a power supply relay and a remote microcomputer. Detection and protection can be more accurate and reliable by using a digital mode. Production efficiency on aspects of installation and debugging can be substantially improved. Possibility of motor burnout can be eliminated, effective protection for motor operation can be provided and dynamic feedback of current status during the operation can also be provided.
Description
technical field [0001] The invention relates to a current detection method and its device, in particular to a high-speed AC motor power supply current detection method and its device. Background technique [0002] Currently widely used AC motor current protection relays are developed for low-frequency (50-100Hz) and low-speed (<6K rpm) motor applications. The action is slow during protection, and the action time ranges from one to several seconds. [0003] For high-speed AC motors (160K ~ 500K rpm), the power supply frequency is high (3 ~ 8KHz), and the harmonic components brought by high frequency switching (60K ~ 100K Hz) are large, and the ordinary motor current detection methods and devices are no longer suitable In such an application environment, the performance is as follows: the threshold value is unreliable, causing malfunction or non-action; the protection speed is too slow, and the motor will be burned in severe cases, resulting in economic losses and a reducti...
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IPC IPC(8): G01R19/00G01R19/165
Inventor 邱澍丰王婷
Owner SUZHOU VEGA TECH CO LTD